Mold.



J. V. BOLAND.

MOLD.

APPLICATION man OCT-1. 1917.

00 R 1H E R4 38 Am w @& t2

Man STAES JOHN v. BOLAND, or sit. LOUIS, MISSOURI.

MOLD.

To all whom z'tmay concern:

Be it known that I, JoHN V. BOLAND, a

- mold or form for the construction of annular walls comprising aplurality of metallic plates secured together edgewise and capable of.being placed inv annular form to provide the exterior mold for the wall,in combination with an inner mold, and means for retaining the exteriormold in proper position and relation to the inner mold, comprising aseries of rods connected to the exterior mold and passing through theinner mold and having connection with a strong retaining member withinthe inner mold.

. Another object of the invention is to provide an exterior mold forforming an annular wall comprising a series of metallic plates securedtogether edge to edge and capable of being placed in annular form, meansfor drawingthe annular mold so formed into proper adjustment, and astrong co6perating member within the mold having connections therewithwhereby the mold is retained in a concentricform.

Another object of the invention is to provide an improved moldconstructed and operating as hereinbefo're described and designedspecially for use in construction of chimneys,

- silos and other structures of that general r the lower end of the moldengaging the up- -Ape-r portionof the finished part of the chimt pe.

In the accompanying drawings, in which my invention is illustrated,

Figure 1 is an open or diagrammatic view of the exterior mold beforebeing placed in annular form. v

Fig. 2 is a view of the mold in position for theformation of a sectionof a concrete structure for which the mold is designed.

Fig. 3 is a plan view of the mold and concrete structure shown in Fig.2.

Fig. 4 is a vertical sectional view through the mold applied to a partof a chimney formed in the mold ina preceding position,

Specification of Letters Patent.

Patented Mar. 18, 1919.

Application filed October 1, 1917. Serial N 0. 194,157.

Fig. 6 is an enlarged detailed view of the construction by which themold is held together in annular form. 1

Fig. 7 is a view illustrating a modified or alternative form of devicefor holding the mold in annular form.

The outer metallic mold is composed of a series of mold sections in theform of plates detachably secured together, edge to edge, and of suchform that when the connected plates are placed in annular form atapering inclosure is formed; This is due to the fact that certain ofthe metallic plates are of slightly less width at their upperextremities than at their lower extremities, while others may be ofuniform width throughout their length, if desired. This construction ofthe plates will be, readily apparent by reference to Fig. 1, in which itwill be observed that there is a central plate 1 which is of slightlyless width at its upper end than at its lower end. Next, there are twoseries of plates 2 which are of uniform width throughout their length,the plates 2 of each series being connected together edgewise, and oneof said seriesbeing connected to .each edge of the plate 1; and to theedge of the last one of each series of the plates 2 there is connected aplate 3 which is of slightly greater width at its lower end than at itsupper end. Next, there are two series of plates 4 of uniform widththroughout their length, the plates 4 of each series being connectedtogether edgewise, and one series of the plates 4'being connected to theouter edgeof each of the plates 3.

The connection between each pair of edgefaces of the latter plates. Thebolts 6 pass through the plates as-stated and have detachable nuts 7threaded on their outer ends for clamping the plates together aswlll heunderstood by reference-to Fig'. 5-. Thesinner 'side of each series areoverlapped. The.

surfaces of the heads of the bolts 6 are flush with the inner surfacesof the plates through which the bolts pass so that the bolt heads do notindent or otherwise disfigure the surface of the concrete structure.

One method of securing the mold together in annular form is illustratedin Fig. 6, in which it will be seen that the plates 4 at the plates 4are provided with vertical series of holes 8 which are so arranged thatthe holes in the overlapping plates register and receive bolts 9, theheads of which rest in countersunk holes in the inner plate. The bolts 9project entirely through the overlapping plates and. are equipped withnuts so that the parts may be securely held to gether.

Another form of connection is illustrated in Fig. 7. In thisconstruction outwardly projecting angle plates 10 are secured near theupper and lower ends of the mold. As shown each of the plates 10 iscomposed of two arms approximately at right angles to each other, one ofthe arms of each plate being bolted to the plates 5 nearest the edges ofthe mold structure, so that there are two of the plates near the lowerend of the mold and two of the plates near the upper end of the mold.The plates 10 at the upper and lower ends of the mold are provided withholes through which the connecting rods 11 extend, the ends of said rodsbeing threaded and having nuts 12 thereon so that the mold will therebybe held in annular form. When the mold is placed in annular form ittapers slightly from its lower end toward its upper end, so that thestructure formed by the mold is gradually tapering. Each of the rods 11may be formed with a polygonal portion 13 for engagement by a wrench orthe like, whereby the rods may be conveniently turned in order torelease the nuts therefrom.

For cooperation with the connecting rods 11 it is desirable to employ anumber of cables 14 to encircle the mold intermediate of the rods 11,said cables being equipped with stretchers 15 of any desired or usualconstruction, whereby the cables may be drawn tight around the mold.

The inner mold is composed of the plates 16 arranged parallel with theplates of the outer mold. Certain of the plates 16 are provided withbrackets 17 which support the expanders 18. The expanders 18 are in theform of rods bent to annular form and seated in the brackets 17 so sasto impart outward pressure against the plates 16. The expanders 18 arein the form of open rings, since the ends of the rods ofwhich theexpanders are formed are not connected. This enables the expanders toadjust themselves to the varying diameters of the mold as the height ofthe chimney increases.

The plates of the outer mold are provided with various holes 19 adaptedto receive rods 20 which pass through said holes and simiing the rings21 are connected by overlapping plates 22 and bolts 23 passing throughthe plates and the vertical angles of the sections. The bolts passthrough slots 24 in the sections of angle iron, so that the rings may bemade of varying diameters to conform to the tapering form of thechimney. At the start it will be understood that the ends of the platesforming the rings 21 are spacedas shown in Figs. 3 and 4. Toward the topand narrow diameter of the chimney the rings are contracted or reducedin diameter, the slots 24 permitting the bolts to assume differentpositions in connection with the angle iron sections.

In starting the construction of a chimney, after the foundation has beenmade, the outer and inner molds are assembled in concontric relation. byconnecting the outer mold to several of the retaining angle iron rings.The space between the outer and inner molds is then filled with concreteand after the concrete has set to a suflicient degree of hardness toretain its shape, the-molds are released and the rods 20 are drawn outof the concrete. The molds are then raised to the next higher stage andafter being adjusted in proper position to form a continuous taperingstructure, the space between the molds is again filled with concrete. 1nthe second .and subsequent positions of the mold, it is unnecessary tousemore than one or two of the angle iron rings near the top of themolds, since the cables encircling the outer .mold are suflicient toretain the lower portion thereof in proper form. This operation isrepeated until the structure has been erected to the proper altitude.After the molds are removed from each stage in the construction of thechimney, the holes in the concrete, left by the withdrawal of the rods20, are filled with concrete by use of a trowel or other. appropriateimplement, so that neither the interior nor the exterior surfaces of thestructure discloses the positions in which the rods were mounted.

From time to time during the erection of the struetureone of the plates4 is removed and the angular plateslO are set over onto as illustratedin Fig. 4, I

the next adjacent plate 4, so that the outer 1'30 mold is successfullyreduced in size in order to meet the requirements for the erection of acontinuously tapering structure.

For raising and lowering the exterior mold angular plates 25 are securedto the exterior mold near the upper end thereof. Ropes or cables may beconveniently connected to the plates 25 and the mold may be therebyraised and lowered as required in the construction of a building.

As illustrated the mold is applied to use in the construction of aconcrete chimney, but it will be readily apparent that it may be usedfor the construction of any other concrete structure of annular form.The exterior metallic mold forms a smooth and ornamental exteriorsurface and produces a structure which in practice has been found to bemuch superior to the structures pro duced by the usual molds composed ofwood.

While I have illustrated the mold of tapering form it will be understoodthat it may be of any other desired shape. There may be other variationsin the construction and arrangement of the parts without departure fromthe scope of the invention.

What I claim and desire to secure by Letters Patent, is

1. A mold made up of a central tapering section of flexible sheet metal;a series of sections of flexible sheet metal each of which is of uniformwidth from end to end, at each side of the central section; a taperingsection of flexible sheet metal at the outer end of each of said seriesof sections; and a series of sections of flexible sheet metal each ofwhich is of uniform width throughout its length at the outer edge ofeach of the lastnamed tapering sections, the two end sections of whichare adapted to overlap when the mold is in annular form; whereby atapering annular mold is formed, said lastnamed sections being removableone at a time, leaving an annular mold of the same taper as the mold wasbefore the section removed 2. A mold made up of a central taperingsection of flexible sheet metal; a series of sections of flexible sheetmetal each of which is of uniform width from end to end, at each side ofthe central section; a tapering section of flexible sheet metal at theouter end of each of said series of sections; a series of sections offlexible sheet metal each of which is of uniform width throughout itslength at the outer edge of each of the last-named tapering sections,the two end sections of which are adapted to overlap when the mold is inannular form; whereby a tapering annular mold is formed, said last-namedsections being removable one at a time, leaving an annular mold of thesame taper as the mold was before the section was removed; and platesoverlapping and securing together the adjacent edges of all of thesections, respectively.

3. A mold made up of a central tapering section of flexible sheet metal;a series of sections of flexible sheet metal each of which is of uniformwidth from end to end, at each side of the central section; a taperingsection of flexible sheet metal at the outer end of each of said seriesof sections; a series of sections of flexible sheet metal each of whichis of uniform width throughout its length at the outer edge of each ofthe last-named tapering sections, the two end sections of which areadapted to overlap when the mold is in annular form; whereby a taperingannular mold is formed, said last-named sections being removable one ata time, leaving an annular mold of the same taper as the mold was beforethe section was removed; plates overlapping and securing together theadjacent edges of all of the sections, respectively; and means forsecuring together the overlapping edges of the last-named series ofsections.

4. A mold composed of sheet metal, open at one side, means for holdingthe mold in annular form, an inner mold concentric with the sheet metalmold, supports on the inner mold, devices supported by said supports forimparting outward pressure against the inner mold, a series of ringswithin the inner mold out of contact therewith, and rods connecting thesheet metal mold with said rings and passing through the inner mold forholding the sheet metal mold rigidly in annular form.

5. A mold composed of sheet metal, open at one side, means for holdingthe mold in annular form, an inner mold concentric with the sheet metalmold, a series of supports on the inner mold, devices supported by saidsupports for impartin outward pressure against the inner mold, and rodsconnecting the sheet metal mold and the inner mold, whereby each of saidmolds is supported in proper position relative to the other.

6. A mold composed of sheet metal, open at one side, means for holdingthe mold in annular form, an inner mold concentric with the sheet metalmold, a series of rings within the inner mold out of contact therewith,and rods coimecting the sheet metal mold with said rings and passingthrough the inner mold for supporting said two molds in proper positionrelative to each other and holding the sheet metal mold rigidly inannular form.

JOHN V. BOLAND.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of latents,

Washington, D. Q

